Abstract: The filling joint is to fill the filling material as close to the ore,rock roof or false roof as possible,so that the filling body supports the roof or false roof of the goaf.In order to solve the problem of roof or false roof falling caused by the poor quality of the filling joint,or to prevent the second step from returning to the mining stone,the ore body is subject to excessive ground pressure.In this paper,the pit filling of Fulaozhuang Iron Mine is taken as the research object.Through the optimization of the filling pipe,multiple middle isolation wooden walls are added,and the method of moving the cutting opening multiple times makes the pit roof filling more safe and fast.The effect is significant and can Effectively increase the topreceiving rate and reduce the security risk of secondstep mining.

Key words: multipoint blanking,partition wall,filling pipe,top connection rate